Title :
Micromachined Millimeter-Wave Rectangular-Coaxial Branch-Line Coupler With Enhanced Bandwidth
Author :
Yi Wang ; Ke, Maolong ; Lancaster, Michael J. ; Huang, Frederick
Author_Institution :
Sch. of Electron., Electr., & Comput. Eng., Univ. of Birmingham, Birmingham, UK
fDate :
7/1/2009 12:00:00 AM
Abstract :
Wideband millimeter-wave branch-line couplers have been demonstrated using micromachined air-filled rectangular-coaxial lines supported by quarter-wavelength stubs. The coaxial lines are constructed by bonding five layers of gold-plated silicon or SU8 slices. The measured coupler shows an insertion loss of 3.2-4.0 dB in the coupled and thru ports between the frequencies 31.3-47.6 GHz. The isolation is better than 12.8 dB, and the return loss less than -10 dB. In addition to providing support, the stubs enhance bandwidth when properly placed.
Keywords :
coaxial cables; micromachining; waveguide couplers; bonding five layers; coaxial lines; enhanced bandwidth; insertion loss; millimeter wave; quarter wavelength stubs; rectangular coaxial branch line coupler; Couplers; micromachining; millimeter-wave devices;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2009.2021872
